Open source code provides a means where developers can quickly build new projects without structuring every feature from the beginning. I specifically follow a lot of jQuery plugins which are built off the ever-popular jQuery library. Since the library is open source, many of the plugins are also released for free using a similar license.
In this gallery I have collected 30 amazing JS plugins for web developers. Each is completely free to download and use within your own website projects, and you may customize features as needed. The most popular items also have a Github repo which includes an FAQ wiki and other support questions. It is my hope that these plugins may introduce web developers towards a new world of dynamic website functionality based on abstraction.
stickyMojo
Imageloader
Chart.js
Sidr
Intro.js
jQuery Spellchecker
Unslider
Typeahead.js
Toolbar.js
Anima
Grunt.js
rasterizeHTML.js
Cool Kitten
ScrollUp
jQuery PowerTip
jPanelMenu
Pep
jQuery Pin
Swipebox
Fathom.js
Textillate.js
Top Drawer
Custom Content Scroller
Dropzone.js
Phono
jQuery Lifestream
Quotes Rotator
Spoiler Alert
Selecter
X-editable
source: http://spyrestudios.com